Function isElement

javascript/atoms/typescript/is-displayed.ts:59–75

(node: unknown, tagName?: string)

  }

  function isElement(node: unknown, tagName?: string): node is Element {
    // Use nodeType instead of instanceof to handle cross-realm Elements
    // (e.g., from iframes), where instanceof checks against a different Element.
    if (!node || (node as Node).nodeType !== 1 /* ELEMENT_NODE */) {
      return false;
    }
    var asElement = node as Element;
    var rawTagName = tagNameDescriptor && typeof tagNameDescriptor.get === 'function'
      ? tagNameDescriptor.get.call(asElement)
      : asElement.tagName;
    var upperTagName = typeof rawTagName === 'string' ? rawTagName.toUpperCase() : '';
    var normalizedTagName = toUpperCaseTag(tagName);
    if (upperTagName === 'FORM') {
      return !normalizedTagName || normalizedTagName === 'FORM';
    }
    return !!upperTagName && (!normalizedTagName || upperTagName === normalizedTagName);
  }

  function getParentElement(node: Node): Element | null {
    var current = node.parentNode;